best way to close a not-responding application in windows 7

I have windows 7 64 bit

when i close any program like Internet Explorer(when its not responding) or chrome or any other programs which are not-responding, through windows task manager, my task manager freezes and explorer bar freezes, and the only option left for me is to power-off the machine and turn it back on...

If taskmanager is not supposed to be used to stop the programs in windows 7, then what is the best way to stop not-responding programs

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Task Manager , Process Explorer and the Command Shell can all be used to achieve the same result if you know the process you want to target and kill.

It sounds suspicious that your whole system freezes and crashes up at the point of killing off an application. As other's have already suggested, running a couple of full system Malware scans would be a good idea to rule out anything untoward. It would be better to get to the root cause of why the system is so unstable rather than continuing to look for ways to forcible kill off processes that should otherwise be stable. Also forcing the system to reboot too many times can lead to worse issues like BSOD and system that might not boot up one day.

If you are able to load the Task Manager next time you need to kill an app, try checking what the system resources are looking like before you kill anything. If you are low on RAM and/or if the CPU is stuck at 100% usage these could account for the instability and show clues as to what application is responsible.

If you find the issue commonly occurs when using Internet Explorer you can try running IE in safe mode to rule out any bad addons that might be to blame (Start > Programs > Accessories > System Tools > Internet Explorer no addons)